850 makes far too little milk foam

So far, our 850 has run completely well and unobtrusively. She's been making very little milk foam since yesterday. Only last week it was decalcified. I had the thought that something had come loose that was now clogging somewhere. We decalcified it again, but it didn't work. Hose and the black nozzle in front etc. is of course all clean and free running by blowing.
Has anyone a tip?

--------------------
Nivona 850

Hello,

may be decalcified again with a very concentrated decalcifier based on amidosulphonic acid. Before the descaling water runs out, stop the machine so that the liquid can work for one night.
If that doesn't help, you would have to remove the electric ceramic valve, open it and remove limescale. - I did that with the Siemens EQ devices, but not yet with Nivona devices. In any case, steam, hot water and coffee are switched over in this valve.

HWS

Hello cervical spine,
thanks,I will try soon. Call me back when I know something.

--------------------
Nivona 850

One more question before I start:
In the meantime, it stabilizes so that the first cappuccino is ok and the second one no longer contains milk.
Changes the possible error, or its elimination, or is that also due to the ceramic valve?

--------------------
Nivona 850

--------------------
Nivona 850

--------------------
Alles ist Wiederverwertbar, sogar diese Buchstaben.
Keine Anfragen oder Hilfe, über E-Mail.

--------------------
Nivona 850

--------------------
Nivona 850

--------------------
Alles ist Wiederverwertbar, sogar diese Buchstaben.
Keine Anfragen oder Hilfe, über E-Mail.

--------------------
Nivona 850

--------------------
Alles ist Wiederverwertbar, sogar diese Buchstaben.
Keine Anfragen oder Hilfe, über E-Mail.

--------------------
Nivona 850

--------------------
Alles ist Wiederverwertbar, sogar diese Buchstaben.
Keine Anfragen oder Hilfe, über E-Mail.

--------------------
Nivona 850